/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.hcatalog.data.transfer;

import java.io.Externalizable;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.util.ArrayList;
import java.util.List;

import org.apache.hadoop.conf.Configurable;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.mapreduce.InputSplit;
import org.apache.hcatalog.mapreduce.HCatSplit;

/**
 * This class will contain information of different {@link InputSplit} obtained
 * at master node and configuration. This class implements
 * {@link Externalizable} so it can be serialized using standard java
 * mechanisms.
 * @deprecated Use/modify {@link org.apache.hive.hcatalog.data.transfer.ReaderContext} instead
 */
public class ReaderContext implements Externalizable, Configurable {

  private static final long serialVersionUID = -2656468331739574367L;
  private List<InputSplit> splits;
  private Configuration conf;

  public ReaderContext() {
    this.splits = new ArrayList<InputSplit>();
    this.conf = new Configuration();
  }

  public void setInputSplits(final List<InputSplit> splits) {
    this.splits = splits;
  }

  public List<InputSplit> getSplits() {
    return splits;
  }

  @Override
  public Configuration getConf() {
    return conf;
  }

  @Override
  public void setConf(final Configuration config) {
    conf = config;
  }

  @Override
  public void writeExternal(ObjectOutput out) throws IOException {
    conf.write(out);
    out.writeInt(splits.size());
    for (InputSplit split : splits) {
      ((HCatSplit) split).write(out);
    }
  }

  @Override
  public void readExternal(ObjectInput in) throws IOException,
    ClassNotFoundException {
    conf.readFields(in);
    int numOfSplits = in.readInt();
    for (int i = 0; i < numOfSplits; i++) {
      HCatSplit split = new HCatSplit();
      split.readFields(in);
      splits.add(split);
    }
  }
}
